Leviticus can also be called “The Book of the Law of the Priests” as it contains very little historical matter, concerning itself with priestly legislation and the practice of the Law among the people. Much importance is placed upon Israel’s separation from all heathen influences so that the nation may retain its religious purity.

Leviticus 16

16:30 For on that day shall the priest make an atonement for you, to cleanse you, that ye may be clean from all your sins before the LORD.